Helmet cover



FIG. 1 is a right side elevation view of a helmet cover showing my new design. The left side elevation view is a mirror image thereof. The broken lines showing a helmet illustrate unclaimed environmental structure that forms no part of the claimed design;

FIG. 2 is a front elevation view of the helmet cover;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top elevation view thereof;

FIG. 5 is a bottom elevation view thereof; and,

FIG. 6 is a cross-sectional right side elevation view thereof showing the helmet cover on a helmet. The left side cross-section elevation view is a mirror image thereof. The broken lines showing the helmet illustrate unclaimed environmental structure that forms no part of the claimed design.

The dashed lines shown throughout the views are understood to represent stitching and form no part of the claimed design. 

CLAIM The ornamental design for a helmet cover, as shown and described. 